From 8e7dc349ac73f4dac444d9b3dad54690014a0114 Mon Sep 17 00:00:00 2001
From: "CanbiZ (MickLesk)" <47820557+MickLesk@users.noreply.github.com>
Date: Thu, 29 Jan 2026 12:43:54 +0100
Subject: [PATCH] core: Add config file handling options | Fix Vikunja update
 with interactive overwrite (#11317)

---
 ct/vikunja.sh   | 14 ++++++++++++++
 misc/tools.func |  6 +++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/ct/vikunja.sh b/ct/vikunja.sh
index 33a1a5050..bd692ace7 100644
--- a/ct/vikunja.sh
+++ b/ct/vikunja.sh
@@ -46,6 +46,20 @@ function update_script() {
   fi
 
   if check_for_gh_release "vikunja" "go-vikunja/vikunja"; then
+    echo
+    msg_warn "The package update may include config file changes."
+    echo -e "${TAB}${YW}How do you want to handle /etc/vikunja/config.yml?${CL}"
+    echo -e "${TAB}  1) Keep your current config"
+    echo -e "${TAB}  2) Install the new package maintainer's config"
+    read -rp "  Choose [1/2] (default: 1): " -t 60 CONFIG_CHOICE || CONFIG_CHOICE="1"
+    [[ -z "$CONFIG_CHOICE" ]] && CONFIG_CHOICE="1"
+
+    if [[ "$CONFIG_CHOICE" == "2" ]]; then
+      export DPKG_FORCE_CONFNEW="1"
+    else
+      export DPKG_FORCE_CONFOLD="1"
+    fi
+
     msg_info "Stopping Service"
     systemctl stop vikunja
     msg_ok "Stopped Service"
diff --git a/misc/tools.func b/misc/tools.func
index 42cc5b8a9..29efe61db 100644
--- a/misc/tools.func
+++ b/misc/tools.func
@@ -1846,7 +1846,11 @@ function fetch_and_deploy_gh_release() {
 
     chmod 644 "$tmpdir/$filename"
     # SYSTEMD_OFFLINE=1 prevents systemd-tmpfiles failures in unprivileged LXC (Debian 13+/systemd 257+)
-    SYSTEMD_OFFLINE=1 $STD apt install -y "$tmpdir/$filename" || {
+    # Support DPKG_CONFOLD/DPKG_CONFNEW env vars for config file handling during .deb upgrades
+    local dpkg_opts=""
+    [[ "${DPKG_FORCE_CONFOLD:-}" == "1" ]] && dpkg_opts="-o Dpkg::Options::=--force-confold"
+    [[ "${DPKG_FORCE_CONFNEW:-}" == "1" ]] && dpkg_opts="-o Dpkg::Options::=--force-confnew"
+    DEBIAN_FRONTEND=noninteractive SYSTEMD_OFFLINE=1 $STD apt install -y $dpkg_opts "$tmpdir/$filename" || {
       SYSTEMD_OFFLINE=1 $STD dpkg -i "$tmpdir/$filename" || {
         msg_error "Both apt and dpkg installation failed"
         rm -rf "$tmpdir"